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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id e23sm3796816pjt.8.2021.07.27.13.59.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 13:59:09 -0700 (PDT) From: Kees Cook To: linux-hardening@vger.kernel.org Cc: Kees Cook , Nick Desaulniers , "Gustavo A. R. Silva" , Keith Packard , Greg Kroah-Hartman , Andrew Morton , linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, linux-block@vger.kernel.org, linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com Subject: [PATCH 28/64] compiler_types.h: Remove __compiletime_object_size() Date: Tue, 27 Jul 2021 13:58:19 -0700 Message-Id: <20210727205855.411487-29-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727205855.411487-1-keescook@chromium.org> References: <20210727205855.411487-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2278; h=from:subject; bh=26+UkQF9u4QR73rE2ugmnkAtGgRJVqdRH0gVQ+miGJI=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOGx79zwuZNTkBGJbxUTLtc6LvVjffViSXdghqh ZCh8w1mJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzhgAKCRCJcvTf3G3AJoOuD/ 9QhIBj8Ac1dYCQqsKDnl8+GV1Fmwz5NE+vrrmgysyx4iAIh5Hi9gSJVcciJHuWfxsYbsfjbgYy0kX1 fb3zQvUIkMQIB2igKikLexaw/u/aMZvCk9Z5omDCckYav5xDMDxop57SAnRwDmI5ma37g307rYAPXK 3MKhIW4uQWUEg9VD//gprsbS2OpIiwxkghySrauZU6lUWDXOFDxi3e7AnfeRnLBMm5P9R7uYb1c63i CCLVixc36sEWt5n1A3nVhugbXoR7XhzcCKsn6dHqVUwhOr0WC1NiDHg09PcpuJ/iyIKZftDHqUPqg6 5qiwdJ4fNBuagx0+hD1UYhVyC4D8uCcU5JbpSaMhqA5ruisKG07SgLC2mW64QD5KC1l5vxwssi27Ef 7z6+Z9XE9eAIUfHNMPoPePEDUngERmhsvmWGVOt9xejvTsuIr7a0dLku55mNRDgPOr3kKzwatg+19w b9l9CzMUNItXijvnyBQc/Vqy1SAb0lYpmUGz8MBzs95DcaaAGbaZmpWiUWaHQ5s823F8qG3r/1SSM/ zjI2/ycPgCzFufboCXRAyrLfLL7g8dxi7bDg8lAiPKcigIIGX0UbyaLeH8fulCViw1XPIwojOh5Gqh 6Oqz9uM0LoNmL8ecwuaSepH7hTO/bHW05UdooSY1mofMkUQTUBDoMmiCWncw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Since all compilers support __builtin_object_size(), and there is only one user of __compiletime_object_size, remove it to avoid the needless indirection. This lets Clang reason about check_copy_size() correctly. Link: https://github.com/ClangBuiltLinux/linux/issues/1179 Suggested-by: Nick Desaulniers Signed-off-by: Kees Cook --- include/linux/compiler-gcc.h | 2 -- include/linux/compiler_types.h | 4 ---- include/linux/thread_info.h | 2 +- 3 files changed, 1 insertion(+), 7 deletions(-) diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index cb9217fc60af..01985821944b 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -41,8 +41,6 @@ #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) -#define __compiletime_object_size(obj) __builtin_object_size(obj, 0) - #define __compiletime_warning(message) __attribute__((__warning__(message))) #define __compiletime_error(message) __attribute__((__error__(message))) diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h index e4ea86fc584d..c43308b0a9a9 100644 --- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -290,10 +290,6 @@ struct ftrace_likely_data { (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \ sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long)) -/* Compile time object size, -1 for unknown */ -#ifndef __compiletime_object_size -# define __compiletime_object_size(obj) -1 -#endif #ifndef __compiletime_warning # define __compiletime_warning(message) #endif diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h index 0999f6317978..ad0c4e041030 100644 --- a/include/linux/thread_info.h +++ b/include/linux/thread_info.h @@ -203,7 +203,7 @@ static inline void copy_overflow(int size, unsigned long count) static __always_inline __must_check bool check_copy_size(const void *addr, size_t bytes, bool is_source) { - int sz = __compiletime_object_size(addr); + int sz = __builtin_object_size(addr, 0); if (unlikely(sz >= 0 && sz < bytes)) { if (!__builtin_constant_p(bytes)) copy_overflow(sz, bytes);